Rotary cutter-head.



0 O. PORTER.

ROTARY CUTTER HEAD. APPLICATION FILED AUG.14, 1909.

940,940. J Patented Nov. 23, 1909.

ww-wtoz (7 05am? FORTE]? C OSCAR PORTER, OF GRAND RAPIDS, MICHIGAN.

ROTARY CUTTER-HEAD.

Specification of Letters Patent.

Patented Nov. 23, 1909.

Application filed August 14, 1909. Serial No. 512,843.

To all whom it may concern:

Be it known that I, C OSCAR PORTER, a citizen of the United States of America, residing at Grand Rapids, in the county of Kent and State of Michigan, have invented certain new and useful Improvements in Rotary Cutter-Heads; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in rotary cutter heads, and its object is to provide a cutter head having a substantially cylindrical surface with no projecting portions outside its periphery except barely sufficient of the cutters to take 0d the chip or cut; to provide improved means for holding the knife and chip breaker in place, and to provide the device with various new and useful features hereinafter more fully described and particularly pointed out in the claims.

My invention consists mainly of a substantially cylindrical cutter head mounted upon a suitable arbor and having for each knife a channel cut therein chordal to the circumference of the cylinder, and a corresponding channel or recess to receive the chip breaker arranged substantially radial and at an angle to the knife recesses and joining the same near the periphery of the cylinder, and open-v ings extending from the knife recess to the surface of the cylinder to receive the outer ends of screws for holding the knife, adjusting screws engaging the rear of the knife and recessed within the cylinder, and cupped annular caps attached to the ends of the cylinder to strengthen the same and hold the portions outside the knives against centrifugal force, as will more fully appear by reference to the accompanying drawings in which:

Figure 1 is a perspective of a cutter head embodying my invention with one of the caps and one knife removed therefrom; Fig. 2 a side elevation of the same partially in section through the axis; Fig. 3 an end elevation partially broken away; and, Fig. 4 a transverse section of the same on the line 44 of Fig. 2.

Like numbers refer to like parts in all of the figures.

1 represents the arbor 011 which is mounted a cylindrical head 2. In this head is cut any convenient number of knife channels 3 extending from end to end thereof and chordal to the circumference of the cylinder. In these channels are placed the knives 5, and at the rear of each knife and recessed within the head, are adjusting screws 11 adapted to be turned by a socket wrench to adjust and assist in holding the knives with their edges projecting outside the periphery of the head only sufficient to properly operate. In the head at intervals and extending from the knife channel to the surface, are circular openings 10 to receive the heads of binding screws 8, which screws extend through slots in the knives and into screw threaded openings in the cylinder. These screws do not extend beyond the surface of the cylinder and are thus substantially embedded therein.

The chip breakers 6 are inserted in separate channels 4 in the head and each is inclined at a considerable angle to the respective knife and arranged substantially radial, being properly located to bring their outer edges into contact with the forward surface of the knives close to the edges thereof. The cupped caps 7 are fitted to the ends ofthe head and engage the partially severed portions of the same outside the knife channels, thus securely holding the said portions against centrifugal force.

It 'will be noted that the inclination of each chip breaker to the respective cutter is such that the centrifugal force, which tends to throw the breaker out of the head, is effectually resisted by this angular contact of the breaker with the knife. The breaker is effectually retained in place without other fastening means than the knife, and at the same time it is forced into intimate contact with the knife, thus satisfactorily and effectually preventing vibration of the same. This head can be safely run at a very high speed, and is very economical of power and safe from accidents.

WVhat I claim is 1. A cutter head, comprising a substantially cylindrical body having knife channels arranged chordal therein, radial opening to receive screw heads extending outward from the knife channels, said head also having chip breaker channels substantially radial whereby the chip breakers engage the knives near their outer edges and at an angle thereto, and screws in the radial openings extending through the knives and into the inner part of the head.

2. A cutter head, comprising a substantially cylindrical body having chordal knife channels and substantially radial chip breaker channels, said head also having radial openings extending through the portion outside the knife channels, screwsin said openings to hold the knife, and circular cupped caps attached to the ends of the heads.

3. A cutter head, comprising a substantially cylindrical body having chordal knife channels cut therein and substantially radial chip breaker channels joining the knife channel at an angle near the surface of the body, radial openings extending outward from the knife channels, screws in said openings and extending through the knife channels into the body, knives, and chip breakers in said channels, the chip breakers engaging the knives at an angle and near the cutting surface'thereof, and adjusting screws embedded in the body and'engaging the rear surface of the knives.

In testimony whereof I affix my signature in presence of two witnesses.

C OSCAR PORTER. Vitnesses LUTHER V. MoUL'roN,

Gnomn HoLLwAY. 

